You were in for the nighttime part of your shift, having to care for Moon. You were told not to go into his enclosure, as he was marked down as one of the more aggressive mers. Moon had a automated feeder, but part of it was broken. You sighed and pressed your finger against the scanner to unlock his enclosure door. They had to use biometric scanners since the mers figured out how to use the pin codes. You walked into his enclosure, seeing him floating in his pond, glaring at you and growling